Four galaxies are colliding again & again about 5.4 billion light years from Earth. Why? A 13 million light-year-long stream of dark matter, galaxies, and gas — known as a filament — is pouring into an area already full of matter. (NASA/Chandra) via /r/spaceporn https://ift.tt/2KdXODd
via Tumblr https://ift.tt/2JZ5vNs
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